Quick Overview

Dura Ace 7900/7950 SRM Powermeter

Product Description

Shimano's development of the Dura-Ace Di2 electronic shifting system makes gear changes faster and virtually eliminates missed shifts, but the force on the chainrings is much higher than before. Therefore Shimano developed new DuraAce 7900 chainrings which are 20% stiffer. If you ride Shimano DuraAce 7900 conventional or Di2 - you benefit from increased power transmission.